<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2_何为数据代理</title>
</head>
<body>
    <!-- 
        数据代理：通过一个对象代理对另一个对象的属性做操作-读、写
     -->
     <div>obj</div>
    
    <script>
        let obj = {x:100}
        let obj2 = {y:300}
        
        Object.defineProperty(obj2, 'x', {
            get(){
                return obj.x
            },
            set(value) {
                obj.x = value
            }
        })
    </script>
</body>
</html>